In most countries before elections, every citizen receives by mail an envelope containing paper leaflets printed by each political group, each describing its political program.
I think that these documents have a great historical value.
I have thought about uploading them to Wikimedia Commons, but I don't think they are compatible with CC-BY-SA-3.0. For instance this category does not contain any of these leaflets.
What is the most appropriate repository where I can upload such political leaftlets?
Preferably one platform for the whole world.